Spanner with strain alarm function

Details Spanner with strain alarm function Spanner with strain alarm function

2006-05-23

2008-11-11

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

C073S862230, C073S862260

Reexamination Certificate

active

07448284

ABSTRACT:
A spanner with a strain alarm function comprises a spanner body having at least one driving head at one end thereof; a strain gauge installed at the spanner body; a display installed in the spanner body electrically connected to the strain gauge; an alarm unit installed in the display; when a spanner body drives an object to be tightened and a twisting force applied to the object has achieved to a predetermined value, the alarm will emit alert signal to users so as to inform the user that the object to be tightened has achieved to a predetermined position. The alarm unit is one of a light emitting body and a buzzer. The predetermined value is a summation of a desired value for tightening the object and an added value under the consideration of a retuning level of the object as the spanner is released from the object.

REFERENCES:
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patent: 4864841 (1989-09-01), Heyraud
patent: 4958541 (1990-09-01), Annis et al.
patent: 4982612 (1991-01-01), Rittmann
patent: 6070506 (2000-06-01), Becker
patent: 6784799 (2004-08-01), Hsien
patent: 6940417 (2005-09-01), Hsien
patent: 6968759 (2005-11-01), Becker et al.
patent: 2002/0178873 (2002-12-01), Hsieh
patent: 2003/0094081 (2003-05-01), Becker et al.
patent: 2004/0261542 (2004-12-01), Hsien

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